Best M4 Lock Washers in 2026

1. 304 Stainless Steel Spring Lock Washers Set，Good Corrosion Resistance, It Can Be Used in a Humid Environment.

2. 7 Most Used Sizes: M2.5 M3 M4 M5 M6 M8 M10, Flat & Lock

3. 260 Pieces，Packed in A Sturdy Transparent Plastic Case

Product 1: Professional Performance: Easy-to-assemble and easy-to-start with its HONDA GX200 commercial series engine, the Aluminum Series power washer is great for contractors who specialize in deck cleaning, wood restoration, and all other professional services

Product 1: Power and Durability: A powerful, reliable, maintenance-free CAT Industrial triplex plunger pump delivers 3400 PSI at 2.5 GPM and includes thermal relief to prevent overheating

Product 1: Sturdy and Portable: The aircraft grade aluminum platform with brushed extruded aluminum tubing offers durability and corrosion resistance; 10-inch premium pneumatic tires deliver ease of maneuverability across various terrain and uneven ground

Internal tooth star lock washers exert a spring force between the fasteners head and the substrate, which maintains the washer hard against the substrate, these push nuts can be used as a kind of automobile fasteners.

Package included: 200pcs 5 sizes of M2, M2.5, M3, M4, M5 locking washers in a transparent plastic case-each size 40 pieces to meet different needs.

High quality: 65Mn metal steel material, anti-corrosion and durable

【CORDLESS POWER WASHER & 2X40V BATTERIES】 Easy Cleaning! upgraded version of the lightweight and compact cordless portable power washer. Cordless design can travel anywhere to do the cleaning job.Our portable power washer comes with TWO 40Volt rechargeable waterproof batteries, enough power for outdoor cleaning. You can get the cordless pressure washer quickly.

【6-IN-1 NOZZLE & ROTATABLE SPRAY NOZZLE 】Make life Easier! Our cordless power washer offers 6 different modes: 0°,20°,20°tilt direction, 40°,foam jet and shower mode for different cleaning tasks. The portable power washer also comes with an extension lance and a rotatable (180°&360°) spray nozzle for cleaning dirt on the roof and inside of the wheels.Your can not oly adjust the pressure washer by adjusting the nozzle, but also rotate the nozzle to adjust the spray angle

【MORE PRESSURE MAX 870 PSI】Our Cordless portable pressure washer can generate up to 870 PSI for superior cleaning power.The machinehas a safety lock to prevent the power washer from being opened accidentally.The machine is battery powered and has much less pressure than a plug-in pressure washer. It is ideal if you want to clean light, small cleaning tasks and use it in places where there is no power-supply. If you need more pressure and a wide range of tasks,this is not the best choice.

【3500 PSI High Pressure】The pressure washers could provide up to 3500 PSI with max 2.6 GPM water flow, upgrade 1800 watt new motor can quickly remove even the most stubborn and encrusted dirt, save your money and time.

【5 Quick-Connect Nozzles】This pressure cleaner has 5 quick-connect nozzles (0°, 15°, 25°, 40°and soap) to provide 4 different kinds of pressure strong water stream. The attached foam cannon can produce rich bubbles to wash your car. Freely select the high-pressure nozzle best suited to your task.

【Total Stop System & Safety Lock】TSS system lets the power washers start up as soon as you squeeze the trigger, shut down as soon as you let go，saving energy and prolonging the pump’s life.The plug of this compact power wash has overheating protection and can prevent accidents such as electric shock.Equipped with a longer hose, it is ideal for washing cars, refreshing outdoor furniture, and cleaning patios.

Nord-Lock wedge-locking washers are made specifically for use with M8 steel bolts. The serrated washers are also compatible with 5/16 inch bolts.

Each pack contains 20 glued pairs of washers.

Applications for Nord-Lock Carbon Steel washers include general steel applications.

3500PSI POWERFUL MOTOR--Upgrade 1800 watt new motor generates Max up to 3500 PSI and 2.6 GPM of water flow and has excellent cleaning ability. Electric pressure washers electric powered can clean cars, bicycles, fences, sidewalks, walls, gardens, yards, outdoor furniture, etc.

TSS & 25FT HOSE--Powerful electric power washer features safety automatic total stop system (TSS), and a 20ft high-pressure hose is long enough for the projects you need,which automatically shuts off the pump when trigger is not engaged to save energy and prolong pump life.

5 NOZZLES & SAFETY LOCK--Changing the angle of the jet becomes easier and more convenient, change the intensity of the water column as needed, from cylindrical to fan-shaped, Soap dispenser to deeply wash any surface. Clean up to 40% faster by extra quickly attaching Turbo Nozzle. The trigger gun features a children safety lock.

【Sizes】M2 M2.5 M3 M4 M5 M6 M8 M10 M12, total 900 pieces/9 sizes of the most commonly used stainless steel spring lock washers, metal lock washers in a plastic case, different sizes can satisfy your different needs.

【Design】Lock washers, spring lock washers, metal lock washers are designed for electrical connections on household and commercial appliances, automotive and marine uses in which the power source has a threaded/bolt-type connection.

【Material】304 Stainless Steel, stainless steel material which have good corrosion resistance in bad environment like high temperature, cold weather, and high humidity areas. They have superior rust resistance and excellent oxidation resistance, which can ensure long time using.

DIMENSIONS: Inside Diameter: 1/2", Outside Diameter: 7/8", Pack of 100, 304 stainless steel.

STAINLESS STEEL: Made from stainless steel for superior corrosion resistance, there're strong and not easy to deform or slip.

LOOSENING PREVENTION: The spring washer offers axial flexibility that's intended to protect fastened assemblies against loosening from vibration.

PORTABLE PRESSURE WASHER: W/ the cordless design, your MFT power washer allows you to bring it everywhere for not only doing car wash yourself but showering your pets on wide lawns. It‘s lightweight at only 7.72 Lbs and is also women-friendly. The 19.7 ft hose greatly improves the efficiency of your cleaning job in a long distance from a bucket, pool, lake, or any water source. You can use the battery power washer by fully charging for 1 hr & check its remaining battery capacity on the washer.

4-IN-1 ROTATABLE SPRAY MODE: Your MFT pressure washers create variable pressures in 4 spray modes, 0°, 15°, 25°, & 40°. The battery power washer makes your cleaning job easier & more convenient. You can adjust the spray modes for the cleaning jobs, such as cleaning the outside of high-rise windows, cars, or other stuff w/ dirt, watering trees, showering your pets, etc. Thus, this 4-IN-1 multiple functional cordless portable power cleaner helps you save more money on different cleaning jobs.

MAX 378.5 PSI POWER CLEANER: Your MFT battery pressure washer can generate up to 378.5 PSI when you are doing your cleaning jobs. The electric pressure washer can discharge water just in seconds, & 2.51 gal water will come out per minute from the cordless pressure washer. You have the guarantee of performing your cleaning chores in the shortest time possible. Therefore, it is of great efficiency to remove dirt & stubborn stains w/ your high-pressure power cleaner.

Parts work best with large head screws such as round, pan, binding, and washer-head screws

Teeth used for locking & tension

Included variants run from #4 to 1/2" in screw size

Set Includes 8 most used sizes:M4 M5 M6 M8 N10 M12 M14 M16,can meet different using needs,good for your fixing or projects working.

Wedge locking washers are generally installed under the nut to prevent the nut from loosening.

Widely used in electrical connections on household and commercial appliances.

Premium Material: The Starlock tooth washers are made of 65 manganese steel material with smooth edges, which is corrosion-resistant, high and low temperature resistant and durable for long-term use.

Easy to Use: The starlock locking washers exert a spring force between the mounting head and the substrate, which keeps the washer firmly fixed and creates more friction and rotation resistance.

Easy to store: All snap rings in the circlip assortment are packed in a sturdy transparent plastic case, which is easy to use, find and transport and can also be used as a storage box.

Package Included: 100 x Split Lock Washers. Inner Dia: 0.39" / 10mm; Outer Dia: 0.63" / 16mm.

Split Lock washers apply greater bolt tension per unit of applied torque as well as a hardened bearing surface adding to a more uniform torque control. 

These lock washers resist loosening caused by vibration and corrosion.

WHAT YOU GET: 100 stainless steel #8x3/8" Spring Lock Washers ideal for use in sheet metal and wet environments with very high form corrosion resistance in 304 material

304 MATERIAL: Our Spring Lock Washers are made of 304 stainless steel, which is longer lasting than other hardware on the market and will last longer in harsh environments such as high temperature, low temperature and high humidity.

WIDELY USED: Our Spring Lock Washers can be used to fix bolts with diameter smaller than the hole of the washer, suitable for general industry such as indoor decoration, outdoor construction, electrical repair and furniture repair.

☆1600PSI POWERFUL MOTOR--Upgrade 1800 watt new motor generates Max up to 1600 PSI and 2.2 GPM of water flow and has excellent cleaning ability. Electric pressure washers electric powered can clean cars, bicycles, fences, sidewalks, walls, gardens, yards, outdoor furniture, etc.

☆TSS & 20FT HOSE--Powerful electric power washer features safety automatic total stop system (TSS), and a 20ft high-pressure hose is long enough for the projects you need, which automatically shuts off the pump when trigger is not engaged to save energy and prolong pump life.

☆5 NOZZLES & SAFETY LOCK--Changing the angle of the jet becomes easier and more convenient, change the intensity of the water column as needed, from cylindrical to fan-shaped, Soap dispenser to deeply wash any surface. Clean up to 40% faster by extra quickly attaching Turbo Nozzle. The trigger gun features a children safety lock.